We present ALMA observations of the 2M1207 system, a young binary made of a brown dwarf with a planetary-mass companion at a projected separation of about 40 au. We detect emission from dust continuum at 0.89 mm and from the J=3−2 rotational transition of CO from a very compact disk around the young brown dwarf. The small radius found for this brown dwarf disk may be due to truncation from the tidal interaction with the planetary-mass companion. Under the assumption of optically thin dust emission, we estimated a dust mass of 0.1 M⊕ for the 2M1207A disk, and a 3σ upper limit of ∼1MMoon for dust surrounding 2M1207b, which is the tightest upper limit obtained so far for the mass of dust particles surrounding a young planetary-mass companion. We discuss the impact of this and other non-detections of young planetary-mass companions for models of planet formation, which predict the presence of circum-planetary material surrounding these objects.
@article{arxiv.1706.03708,
title = {ALMA Observations of the Young Substellar Binary System 2M1207},
author = {L. Ricci and P. Cazzoletti and I. Czekala and S. Andrews and D. Wilner and L. Szucs and G. Lodato and L. Testi and I. Pascucci and S. Mohanty and D. Apai and J. Carpenter and B. Bowler},
journal= {arXiv preprint arXiv:1706.03708},
year = {2017}
}
Comments
10 pages, 6 figures, accepted for publication in AJ